Question

How can I use a jQuery UI Spinner widget in Knockout bound input?

    <tbody data-bind="foreach: orders">
        <tr>
            <td data-bind="text: Name"></td>
            <td><input type="number" style="width: 100px;" data-bind="value: Price" /></td>
            <td><input type="number" style="width: 50px;" data-bind="value: VAT" /></td>
            <td><input type="number" style="width: 50px;" data-bind="value: Number" /></td>
            <td data-bind="text: Final()"></td>
            <td><a href="javascript:void(0);" data-bind="click: $root.removeOrder">Remove</a></td>
        </tr>    
    </tbody>

Answer 1

The best way is to create custom binding to bind spinner to the input:

ko.bindingHandlers.spinner = {
    init: function(element, valueAccessor, allBindingsAccessor) {
        //initialize spinner with some optional options
        var options = allBindingsAccessor().spinnerOptions || {};
        $(element).spinner(options);

        //handle the field changing
        ko.utils.registerEventHandler(element, "spinchange", function () {
            var observable = valueAccessor();
            observable($(element).spinner("value"));
        });

        //handle disposal (if KO removes by the template binding)
        ko.utils.domNodeDisposal.addDisposeCallback(element, function() {
            $(element).spinner("destroy");
        });

    },
    update: function(element, valueAccessor) {
        var value = ko.utils.unwrapObservable(valueAccessor()),
            current = $(element).spinner("value");

        if (value !== current) {
            $(element).spinner("value", value);
        }
    }
};

And then just use it instead of value binding:

<input
    type="number"
    style="width: 100px;"
    data-bind="spinner: Price, spinnerOptions: { min: 0 } " />

Here is working fiddle: http://jsfiddle.net/vyshniakov/SwKGb/